And how many Treason Trials were there? NOT ONE! Even Jeff Davis wanted a treason trial and was denied it by Salmon P. Chase. Davis even rejected Chase’s offer of pardon demanding a Treason Trial.
Chase was worried Davis would prove secession legal in a court of law.
"If you bring these (Confederate) leaders to trial it will condemn the North, for by the Constitution secession is not rebellion. Lincoln wanted Davis to escape, and he was right. His capture was a mistake. His trial will be a greater one." - SCOTUS Chief Justice Salmon P. Chase, July 1965 (Foote, The Civil War, Vol. 3)
I found his statements on the subject last year, and now i've forgotten where I put the links for them. I've been trying to find them again for a week or so.
Anyway, I remember him saying that they would lose in court everything they had gained on the battlefield, and he strongly urged them to avoid going down this path.
They wisely followed his advice.
That bastard owes his life to the fact Lincoln wanted the war over and resentment and animosity to the South tamped down. “Let them up easy’’ he told Grant.